List of top Physics Questions on Current electricity asked in KCET

The number of electrons moving per second through the filament of a lamp of 60W operating at 120V is nearly (e = 1.6 \(\times\) 10\(^{-19}\) C) \textunderscore\textunderscore\textunderscore\textunderscore\textunderscore\textunderscore\textunderscore

Which of the following circuits is correct for verification of Ohm's law?

Current flowing through a wire decreases linearly from 10A to zero in 4s as shown in the graph. Find the total charge flowing through the wire in the given time interval.

Given below are two statements:
Statement I: The resistivity of a conductor is independent of its temperature
Statement II: The resistivity of a semiconductor decreases with increase in temperature
Select the correct option.

In the figure, the values of currents I\(_1\), I\(_2\) and I\(_3\) respectively are

Given, a current carrying wire of non-uniform cross-section, which of the following is constant throughout the length of the wire?

In the circuit shown, the end A is at potential \( V_0 \), and end B is grounded. The electric current indicated in the circuit is

The electric current flowing through a given conductor varies with time as shown in the graph below. The number of free electrons which flow through a given cross-section of the conductor in the time interval \( 0 \leq t \leq 20 \, \text{s} \) is

The I-V graph for a conductor at two different temperatures 100°C and 400°C is as shown in the figure. The temperature coefficient of resistance of the conductor is about (in per degree Celsius)

An electric bulb of 60 W, 120 V is to be connected to a 220 V source. What resistance should be connected in series with the bulb, so that the bulb glows properly?

In an experiment to determine the temperature coefficient of resistance of a conductor, a coil of wire X is immersed in a liquid. It is heated by an external agent. A meter bridge set up is used to determine resistance of the coil X at different temperatures. The balancing points measured at temperatures \( t_1 = 0^\circ \text{C} \) and \( t_2 = 100^\circ \text{C} \) are 50 cm and 60 cm respectively. If the standard resistance taken out is \( S = 4 \, \Omega \) in both trials, the temperature coefficient of the coil is

\( \overrightarrow{E} \) is the electric field inside a conductor whose material has conductivity \( \sigma \) and resistivity \( \rho \). The current density inside the conductor is \( \overrightarrow{j} \). The correct form of Ohm's law is

What will be the reading in the voltmeter and ammeter of the circuit shown ?

In the following circuit what are P and Q :

In a potentiometer experiment, the balancing point with a cell is at a length 240 cm. On shunting the cell with a resistance of 2 $\Omega$, the balancing length becomes 120 cm. The internal resistance of the cell is

Kichhoff?s junction rule is a reflection of

The readings of ammeter and voltmeter in the following circuit are respectively

In metre bridge experiment, with a standard resistance in the right gap and a resistance coil dipped in water (in a beaker) in the left gap, the balancing length obtained is $?l?$. If the temperature of water is increased, the new balancing length is

The value of $I$ in the figure shown below is

Effective resistance between $A$ and $B$ in the following circuit

In the following network potential at $'O'$

Variation of resistance of the conductor with temperature is as shown .The temperature co-efficient $(\alpha)$ of the conductor is

Mobility of free electrons in a conductor is

Four identical cells of emf $E$ and internal resistance $r$ are to be connected in series. Suppose if one of the cell is connected wrongly, the equivalent emf and effective internal resistance of the combination is

A tuned amplifier circuit is used to generate a carrier frequency of $2\, MHz$ for the amplitude modulation. The value of $\sqrt{LC}$ is